JPH0566123B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

In the present invention, there is a seat reclining device R shown in Utility Model Application No. 59-10186, for example, but this will be explained based on FIG. 5. This seat reclining device R is fixed to a seat cushion A. The base plate 10, which is rotatably pivoted on the outside of the base plate 10 and fixed to the seat back B, engages with the upper teeth 11a formed on the arm 11 to move the arm 11 to a desired rotation angle position. It is provided with a lower tooth 18 that is held in place, and a release lever 13 that engages and disengages the lower tooth 18 from the upper tooth 11a. The arm 11 is sandwiched between the base plate 10 and the holder plate 14, and is pivotally attached to the base plate 10 via the arm shaft 12. On the outside of the holder plate 14, the arm shaft 12 is connected via an E-ring 15. A release lever 13 is attached, and a washer 1 is attached to the outside of the release lever 13.
6, return springs 17 are connected to the base plate 10 coaxially with the arms 11, respectively.
installed on. Further, the upper tooth 11a carved on the arm 11 meshes with the lower tooth 18 in the normal state. This lower tooth 18 is pivotally attached between the base plate 10 and the holder plate 14 by a pin 19.
A cam 20 is engaged with a recess 18b provided in the lower teeth 18. This cam 20 is pivoted between the base plate 10 and the holder plate 14 via a shaft 21. Further, on the outside of the holder plate 14, a rod lever 22 is engaged and fixed to the shaft 21. A pin rod 22a is formed at the other end of the rod lever 22, and the rod lever 22 is connected to the lever 13 via the pin rod 22a. The pin rod 22a is inserted into the long hole 13a of the lever 13,
It is prevented from coming off by a push nut 23.

[Problems to be solved by the invention]

In the seat reclining device configured as described above, in order to securely maintain the meshing state of the lower teeth and the upper teeth and to obtain sufficient strength to withstand the load applied to the seat back in the event of a vehicle collision, the upper teeth and lower teeth are The teeth have an appropriate standard pitch and are finished with high precision by broaching. In such engagement between the top teeth and lower teeth, in order to make the reclining angle of the seat back smaller, the pitch of the teeth of the top teeth and lower teeth must be made smaller, but in this case, from the viewpoint of strength and accuracy, There is a limit. In addition, in such a seat reclining device, the release lever and lower teeth are engaged via the rod lever and cam, so when the seatback is in the forward tilted position, the release lever is pulled up from the normal release lever position. If the seat bag is in the forward folded position, there is a risk that the seat belt attached to that seat position may get stuck between the release lever and the seat cushion. If you wear the seatbelt while the seatbelt is caught between the release lever and the seat cushion, there is a risk that the release lever will be pulled up while the car is moving, causing the seatback to fall forward, which is unfavorable from a safety standpoint. . The present invention was developed by focusing on the above-mentioned problems, and it is possible to securely maintain the engagement between the upper teeth and the lower teeth, obtain sufficient strength, and recline in smaller steps than conventional seat reclining devices. It is an object of the present invention to provide an adjustable seat reclining device.

[Means to solve the problem]

In the present invention, there is provided a base plate fixed to the seat cushion, an arm plate rotatably pivoted to the base plate and fixed to the seat bag, and a top tooth fixed to the lower end side of the arm plate. a lower tooth that engages with the upper tooth to hold the seat back at a desired reclining angle position; a cam that engages with the lower tooth; a release lever that engages and disengages the lower tooth from the upper tooth via the cam; and the arm. In a seat reclining device comprising a plate, a holder plate that holds the lower teeth and the cam between the base plate, the lower teeth are composed of a pair of teeth plates having a plurality of teeth of the same pitch; Each tooth plate is rotatably mounted coaxially, and the pitches of a plurality of teeth of a pair of coaxially mounted tooth plates are deviated from each other by 1/2 tooth.

[Effect]

Next, the operation will be explained based on the drawings. Figures 2 to 4 show a seat reclining device R in which the upper teeth 11a and the tooth plates 35 of the lower teeth 18 are engaged and the seat back B is held at an arbitrary reclining position. By rotating the release lever 13 upward, the cam plate 37 is rotated clockwise via the pin 41 implanted in the release lever, and the cam plate 37 is rotated clockwise through the pin 41 implanted in the release lever. The convex portion 37a of No. 37 presses the side wall portion 35b of the engagement recess 35a provided in the tooth plate 35 downward. As a result, the tooth plate 35 rotates counterclockwise around the pin 19, the engagement between the upper tooth 11a and the tooth plate 35 is released, and the seat back B can be reclined freely. After that, Seat Back B
When the release lever 13 is rotated backward by the minimum adjustment angle, that is, the pitch of 1/2 tooth of the tooth profile of the upper tooth 11a and the lower tooth 18, the tooth plate 36 is rotated counterclockwise by the cam plate 38. The seat reclining device R is moved and engages with the upper tooth 11a, and the seat reclining device R is locked at this position. In the above, we have described the method of reclining the minimum angle from the state where the tooth plate 35 is engaged with the atsupato tooth 11a, but when reclining by any angle from this state, first press the release lever in the same way as above. 13 upward to release the engagement between the upper tooth 11a and the tooth plate 35, allowing the seat back B to be reclined freely.Next, when the seat back B is reclined by an arbitrary angle and the release lever 13 is released, the tooth The plates 35 and 36 each have a spring 3
The cam plates 37 and 38 are rotated counterclockwise by the cam plates 9 and 40.
1a, one of the tooth plates 35 and 36 is pressed in the direction of meshing with the tooth plate 11a.
The seat reclining device R is locked at that position.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, in which the same parts as the conventional structure are denoted by the same reference numerals. As shown in FIG. 1, the seat reclining device R according to the present invention includes a base plate 10 fixed to a seat cushion A, a shaft 12 rotatably pivoted on the outside of the base plate 10, and a seat back B. A fixed arm plate 11, a top tooth 11a fixed to the lower end side of the arm plate 11, and a lower tooth 18 that engages with the top tooth 11a to hold the seat back B at a desired reclining angle position.
and a cam 20 that engages with this lower tooth 18,
A release lever 13 that engages and disengages the lower tooth 18 from the top tooth 11a via the cam 20, and a release lever 13 that connects the arm plate 11, the lower tooth 18 and the cam 20 to the base plate 1.
0, and a holder plate 14 which is held between the two. The arm plate 11 is the base plate 1
0 and a holder plate 14, and is pivotally attached to the base plate 10 via the shaft 12. On the outside of the holder plate 14,
A return spring 17 is attached to the shaft 12.
One end of the is attached. A long arc-shaped hole 31 is formed in the upper part of the base plate 10, and a pin 32 is formed at both ends 31a and 31b.
The rotation range of the arm plate 11 is limited. Additionally, outward ribs 10a are formed on the peripheral edge of the base plate 10 to provide strength to the base plate. The other end of the return spring 17 is connected to the tip 32 of the pin 32 that protrudes outside the arm plate 11.
a, and urges the arm plate 11 to rotate counterclockwise. Further, pins 32, 33,
A top tooth 11a is fixed by 34, and under normal conditions, the top tooth 11a meshes with the lower tooth 18 and holds the arm plate 11 in a reclining angular position. The pin 32 is formed in a stepped manner in order to fix the top tooth 11a to the arm plate 11 and to lock the return spring 17 at its upper end. It has a stopper part 32b that comes into contact with both ends 31a, 31b of the circular arc-shaped elongated hole 31 formed in the arcuate hole 31. The lower tooth 18 includes a pair of tooth plates 35 and 36.
The base plate 1 is connected to the base plate 1 by a pin 19.
0 and the holder plate 14, and cam plates 37 and 38 are engaged with recesses 35a and 36a provided in the tooth plates 35 and 36, respectively. Further, a plurality of teeth of the same pitch are cut on the pair of tooth plates 35 and 36, with the pitch being shifted from each other by 1/2 tooth with respect to the pin 19. That is, the pair of tooth plates 35, 36b have the same blank shape before being cut,
During gear cutting, the pitch is shifted by 1/2 tooth for each gear, so when attached to pin 19, the pitch will be 1/2
The pitch is off by one tooth. The cam 20 is made up of the pair of cam plates 37 and 38, and is pivoted between the base plate 10 and the holder plate 14 via the lever shaft 21. Further, the pair of cam plates 37, 38 are formed with convex portions 37a, 38a to engage with the concave portions 35a, 36a of the tooth plates 35, 36, and are rotated counterclockwise by springs 39, 40, respectively. It is rotationally biased. Further, a release lever 13 is provided on the outside of the holder plate 14 via the lever shaft 21 to connect the holder plate 14 and the base plate 10.
It is attached to the shaft. A lever pin 41 is implanted in the release lever 13, and when the release lever 13 is rotated upward, the cam plate 37,
A protrusion 13a is formed in the center of the protrusion 13a, which is arranged so as to be in sliding contact with the protrusions 37b and 38b of 38, and is bent toward the base plate 10 side. This protrusion 13a is located at the peripheral rib 1 of the base plate 10 when the seat reclining device R is in the arbitrary adjustment position and the forward tilted position.
0a and holds the release lever 13 at its lowest position. In addition, the release lever 1
3, the lever pin 41 is inserted into the convex portions 37b, 38b of the cam plate when the seat reclining device R is in the arbitrary adjustment position and the forward tilted position.
Since the release lever 13 is arranged so as not to come into contact with the release lever 13, the release lever 13 is configured to rest at the lowermost position due to its own weight. Thereby, the seat belt or the like does not get stuck between the seat cushion A and the release lever 13, and the safety of the occupant can be improved.

【effect】

According to the structure of the above embodiment, the lower teeth 18 consists of a pair of tooth plates 35, 36 having a plurality of teeth of the same pitch, and the pair of tooth plates 35, 36 are rotatably coaxially mounted, respectively. , the pitch of the teeth of the pair of coaxially mounted tooth plates 35 and 36 is 1/2 of each other.
Since it is formed to be shifted by the amount of the teeth, it is possible to securely maintain the engagement between the upper teeth 11a and the lower teeth 18, and to obtain sufficient strength to withstand the load applied to the seat back B in the event of a vehicle collision. This has the effect of making it possible to adjust the reclining position, thereby improving the comfort of the occupants when the vehicle is running.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
Fig. 2 is an explanatory diagram of the same embodiment as seen from the side, Fig. 3 is a sectional view taken along the line C-C of the same embodiment, Fig. 4 is a schematic diagram showing the meshing state of the embodiment, and Fig. 5 is a conventional It is an exploded perspective view showing an example. A... Seat cushion, B... Seat back, R... Seat reclining device, 10...
Base plate, 11... Arm plate (arm), 11a... Atsupatoosu, 13... Release lever, 14... Holder plate, 18...
Lower teeth, 35, 36... tooth plate, 3
7,38...cam plate.

Claims (1)

[Claims] 1. A base plate fixed to the seat cushion, an arm plate rotatably pivoted to the base plate and fixed to the seat bag, a top tooth fixed to the lower end side of the arm plate, and a top tooth that meshes with the top tooth. a lower tooth that holds the seat back at a desired reclining angle position; a cam that engages with the lower tooth; a release lever that engages and disengages the lower tooth from the upper tooth via the cam; In the seat reclining device including a holder plate that holds the cam between the cam and the base plate, the lower tooth is composed of a pair of teeth plates having a plurality of teeth of the same pitch, and the pair of teeth plates are rotatably coaxially connected to each other. The pitch of multiple teeth of a pair of tooth plates coaxially mounted on the top of the tooth plate is 1/2 of each other.
A seat reclining device characterized by being formed so as to be shifted by the amount of teeth.